Perhaps you should try some spelling variations:
danh dai » danh dau, danh di, danh sai
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (ve cac)) ky nang o hoi. hieu va cam ((thuc va) or (hoc dan)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (ve cac)) ky nang o hoi. hieu va cam ((thuc va) OR (hoc dan)) danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (ve cac)) ky nang o hoi. hieu va cam ((thuc va) or (hoc dan)) danh dai cua tre*.